How to update only selected properties of an entity (partial updates)?

Short answer: Attach entity, then set only modified properties as Modified. Use context.Entry(entity).Property(p => p.PropertyName).IsModified = true. Useful for PATCH operations.

Real-world example (ShopNest)

ShopNest’s order service uses EF Core to save an Order and its line items in one SaveChangesAsync() call inside a transaction.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.